In an ac circuit, the current is given by \(i=5\sin(100t-\frac{\pi}{2})\) and the ac potential is V = 200 sin(100t) volt. The power consumption is:
1. 20 W
2. 40 W
3. 1000 W
4. 0
A \(100~\Omega\) resistor is connected to a \(220~\text{V}\), \(50~\text{Hz}\) ac supply. The net power consumed over a full cycle is:
1. | \(484~\text{W}\) | 2. | \(848~\text{W}\) |
3. | \(400~\text{W}\) | 4. | \(786~\text{W}\) |
A coil of inductive reactance of 31 Ω has a resistance of 8 Ω. It is placed in series with a condenser of capacitive reactance 25 Ω. The combination is connected to an a.c. source of 110 V. The power factor of the circuit is:
1. 0.56
2. 0.64
3. 0.80
4. 0.33
The power factor of the given circuit is:
1. | \(1 \over 2\) | 2. | \(1 \over \sqrt2\) |
3. | \(\sqrt3 \over 2\) | 4. | \(0\) |
The power factor of a series LCR circuit in resonance condition is:
The potential differences across the resistance, capacitance and inductance are 80 V, 40 V and 100 V respectively in an L-C-R circuit. What is the power factor of this circuit?
1. 0.4
2. 0.5
3. 0.8
4. 1.0
An inductor of inductance L and resistor of resistance R are joined in series and connected by a source of frequency ω. The power dissipated in the circuit is:
1.
2.
3.
4.
In a series LCR circuit, the current through the ac source is 2 A. If resistor R has a resistance of 10 Ω, the average power dissipated in the circuit is:
1. 20 W
2. 30 W
3. 10 W
4. 40 W
What is the average power dissipated in the ac circuit if current i = 100sin100t A and V=100sin(100t+π/3) volts?
1. 2500 W
2. 250 W
3. 5000 W
4. 4000 W
A circuit consists of 3 ohms of resistance and 4 ohms of reactance. The power factor of the circuit is:
1. 0.4
2. 0.6
3. 0.8
4. 1.0